Identifying EB nodes when using STL

[AlexGlock]

Hi warpx team,

I using the picmi.EmbeddedBoundary class to represent some electrodes in my simulation domain. However, I still need to check if a couple of node are within the elctrodes or not. Is there an option to access/query an underlying implicit function even though I initialized from an STL or do I have to create my own implicit function with the STL using a package like trimesh?

As always many thanks in advance.
Cheers,
Alex

[RemiLehe]

Thanks for your question!

For the WarpX output (e.g., openPMD files), you can request eb_covered to be present:

Does that work for you?

[AlexGlock]

Hi,
Thanks for the answer and this nice tip.
This works for the post processing, however I already need the EB node mask within my cutom field solver during runtime :/
For now I will stick to the external solution using trimesh. I dont know how hard it would be to get this information from the underlying Amrex mesh but it would be a nice feature if such an EB mask would be exposed as attribute of the picmi.EmbeddedBoundary class in a future version of warpx.

Cheers,
Alex